package com.atguigu.netty.websocket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * webSocket 长连接开发1
 *
 * @author: 叶子
 * @date: 2022/02/19 20:57
 **/
public class MyServer {
    public static void main(String[] args) {
//          创建两个线程组
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
//                            因为是基于http协议，使用http的编码和解码器
                            pipeline.addLast(new HttpServerCodec());
//                            是以块方式写，添加ChunkedWriteHandler
                            pipeline.addLast(new ChunkedWriteHandler());
                            /*
                             1.http数据在传输过程证中是分段的，HttpObjectAggregator,就是可以将多个段聚合
                             2.这就是为什么当浏览器发送大量数据时，就会发出多次http请求
                             */
                            pipeline.addLast(new HttpObjectAggregator(8192));
                            /*
                            1.对webSocket，它的数据是以帧(frame)形式传递
                            2.可以看到webSocketFrame 下面有六个子类
                            3.浏览器请求时  ws://localhost:7000/hello表示请求的uri
                            4.WebSocketServerProtocolHandler 核心功能是将http协议升级为ws协议，保持长连接
                            5.是通过一个状态码 101
                             */
                            pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));
                            //自定义的handler，处理业务逻辑
                            pipeline.addLast(new MyTextWebSocketFrameHandler());
                        }
                    });
//                      启动服务器
            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}